>>16602326Kyushu is, giving a rough guess cause I can't find a real-length, going by images and ratios, roughly 250 km long, or 155 miles. That's East/West in Hoenn terms. So from Rustboro to Lilycove, due to two bends, is probably somewhere around 270 km, or 167.77 miles.
Average human walking speed of we'll say 4mph (no bike, no running shoes), for 8-12 hours a day (battles, capture, rest remainder) would take about 42 days to walk from Rustboro to Lilycove.
I can't remember the path you take all around this spinny ass region but a year sounds about right. Bikes, running shoes, and the characters limitless tireless motion helps though, and Fly.